Longline vessels have distinctive vessel tracks—these reflect the setting and hauling of the vessel’s fishing gear. The setting of lines is done more quickly than the hauling.
Buoys are often associated with longline vessels and the buoys' movements can display characteristic tracks as the longlines are deployed and then hauled in.
Buoy locations can be particularly useful for vessel movement analysis when there is limited AIS reporting from the vessel itself.
Even when longline vessels move in less methodical patterns, looping tracks with variable speeds, as the lines are set and hauled are still evident.
Learn more: Vessel Subtypes